Until recently, conducting surveillance and delivering munitions from the air was the sole province of nation-state air forces. Now, anyone with a drone can do the same. Over the last decade, drones-or unmanned aircraft systems-have become cheaper, more capable, easier to fly, and ubiquitous. Even hobby machines can pose a military threat. Combined Joint Task Force-Operation Inherent Resolve Commander Army Lt. Gen. Stephen J. Townsend said ISIS has made extensive use of drones to observe bases and deliver explosives.
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